REPORT OP COMMITTEE ON PUBLICATION 



75 



Comparison of Stocks With All Scions. Crop Gathered and Weighed 



October 1, 1914. 



Average Average Average 



Stock Crop Bal Acidity 



Rip. X Rup. 3309 9.57 27.45 .59 



Mour. X Rup. 1202 8.35 27.03 .64 



Rip. gloire 7.73 27.47 .58 



Rip. X Rup. 3306 7.60 27.79 .58 



Rip. X Berl. 420 A 6.89 26.32 .64 



Chass. X Berl. 41 B 6.78 25.74 .66 



Lenoir 5.38 26.51 .63 



Rup. St. George 5.25 27.72 .58 



Comparison of Scions with All Stocks. 



Average 

 Scion Crop 



Malaga 12.61 



Tokay 11.96 



Ali. H. Bouschet 11.19 



Petite Sirah 9.35 



Valdepenas 8.32 



Palomino 8.10 



Semillon 6.30 



Muscat 6.27 



St. Macaire 4.00 



Gros Mansenc 2.87 



Lagrain 2.51 



Sultana 



Sultanina 



Average of grafted and 



ungrafted varieties 27.93 .62 



Ungrafted 



Average 

 Acidity 



23.17 



.60 

 .49 

 .75 

 .97 

 .90 



.72 



.47 



.70 



Size of Stock, Scion and Union of All Grafted Vines. 

 Measurements made June 16-23, 1915. 



It is for practical reasons of great importance to have grafted vines with 

 a stock as large and, if possible, larger than the stem or scion in order to 

 dispense with the grape stake as early as possible. However, as a rule, we 

 find that the stock in most cases is the weaker grower of the two; only in a 

 few cases have we been able to observe that a stock and a stem of the 

 vine were of the same diameter. Measurements were taken on 1201 grafted 

 vines. Every vine was measured at three levels. With vines, which were 

 irregular in shape, several measurements were made to obtain average 

 dimensions. The first measurement at the largest diameter of the swelling, 

 and the third measurement two or three cc. below the union. The measure- 

 ments are shown in Table A, expressed in millimeters. The last column 

 gives the diameter of the stock in percentage of diameter of the scion. 



The 1201 vines measured represent 130 combinations consisting of 18 

 vinifera scion varieties and 10 resistant stocks. The average for all was as 

 follows. 



Average diameter of all stems above union 39 m/m 



Average diameter of all stems below union 33 m/m 



Average ratio scion, stock 84.6% 



Average diameter of all unions 56 m/m 



Vines where the stock is smaller than the scion have the disadvantage 

 that they require permanent stakes. An ideal vine would be one which, while 

 making a good, strong and healthy growth every year, ripens its canes well, 

 giving a good average crop of grapes every year and forms a stock strong 



